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Measure frameskip timing before sleeping

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This commit is contained in:
AJ Martinez 2023-11-05 04:30:45 -07:00
parent 0201d90d21
commit 0677708216
1 changed files with 19 additions and 13 deletions
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32
src/d_main.cpp
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@ -973,20 +973,9 @@ void D_SRB2Loop(void)
// Fully completed frame made.
finishprecise = I_GetPreciseTime();
if (!singletics)
{
INT64 elapsed = (INT64)(finishprecise - enterprecise);
// in the case of "match refresh rate" + vsync, don't sleep at all
const boolean vsync_with_match_refresh = cv_vidwait.value && cv_fpscap.value == 0;
if (elapsed > 0 && (INT64)capbudget > elapsed && !vsync_with_match_refresh)
{
I_SleepDuration(capbudget - (finishprecise - enterprecise));
}
}
// Capture the time once more to get the real delta time.
finishprecise = I_GetPreciseTime();
// Use the time before sleep for frameskip calculations:
// post-sleep time is literally being intentionally wasted
deltasecs = (double)((INT64)(finishprecise - enterprecise)) / I_GetPrecisePrecision();
deltatics = deltasecs * NEWTICRATE;
@ -1006,6 +995,23 @@ void D_SRB2Loop(void)
{
frameskip = 0;
}
if (!singletics)
{
INT64 elapsed = (INT64)(finishprecise - enterprecise);
// in the case of "match refresh rate" + vsync, don't sleep at all
const boolean vsync_with_match_refresh = cv_vidwait.value && cv_fpscap.value == 0;
if (elapsed > 0 && (INT64)capbudget > elapsed && !vsync_with_match_refresh)
{
I_SleepDuration(capbudget - (finishprecise - enterprecise));
}
}
// Capture the time once more to get the real delta time.
finishprecise = I_GetPreciseTime();
deltasecs = (double)((INT64)(finishprecise - enterprecise)) / I_GetPrecisePrecision();
deltatics = deltasecs * NEWTICRATE;
}
}